/*
 * Copyright (c) 2019-2029, Dreamlu 卢春梦 (596392912@qq.com & www.dreamlu.net).
 * <p>
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.gnu.org/licenses/lgpl.html
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.jintian.smart.kernel.common.util;

import lombok.experimental.UtilityClass;
import org.springframework.core.BridgeMethodResolver;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.MethodParameter;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.SynthesizingMethodParameter;
import org.springframework.lang.Nullable;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

/**
 * 类工具类
 */
@UtilityClass
public class ClassUtil extends org.springframework.util.ClassUtils {
    private static final ParameterNameDiscoverer PARAMETER_NAME_DISCOVERER = new DefaultParameterNameDiscoverer();

    /**
     * 获取方法参数信息
     *
     * @param constructor    构造器
     * @param parameterIndex 参数序号
     * @return {MethodParameter}
     */
    public static MethodParameter getMethodParameter(Constructor<?> constructor, int parameterIndex) {
        MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
        methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
        return methodParameter;
    }

    /**
     * 获取方法参数信息
     *
     * @param method         方法
     * @param parameterIndex 参数序号
     * @return {MethodParameter}
     */
    public static MethodParameter getMethodParameter(Method method, int parameterIndex) {
        MethodParameter methodParameter = new SynthesizingMethodParameter(method, parameterIndex);
        methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
        return methodParameter;
    }

    /**
     * 获取Annotation
     *
     * @param method         Method
     * @param annotationType 注解类
     * @param <A>            泛型标记
     * @return {Annotation}
     */
    @Nullable
    public static <A extends Annotation> A getAnnotation(Method method, Class<A> annotationType) {
        Class<?> targetClass = method.getDeclaringClass();
        // The method may be on an interface, but we need attributes from the target class.
        // If the target class is null, the method will be unchanged.
        Method specificMethod = ClassUtil.getMostSpecificMethod(method, targetClass);
        // If we are dealing with method with generic parameters, find the original method.
        specificMethod = BridgeMethodResolver.findBridgedMethod(specificMethod);
        // 先找方法，再找方法上的类
        A annotation = AnnotatedElementUtils.findMergedAnnotation(specificMethod, annotationType);
        if (null != annotation) {
            return annotation;
        }
        // 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
        return AnnotatedElementUtils.findMergedAnnotation(specificMethod.getDeclaringClass(), annotationType);
    }

    public static List<Class<?>> convertClassNamesToClasses(final List<String> classNames) {
        if (classNames == null) {
            return null;
        }
        final List<Class<?>> classes = new ArrayList<>(classNames.size());
        for (final String className : classNames) {
            try {
                classes.add(Class.forName(className));
            } catch (final Exception ex) {
                classes.add(null);
            }
        }
        return classes;
    }

    public static Class<?>[] toClass(final Object... array) {
        if (array == null) {
            return null;
        } else if (array.length == 0) {
            return ArrayUtil.EMPTY_CLASS_ARRAY;
        }
        final Class<?>[] classes = new Class[array.length];
        for (int i = 0; i < array.length; i++) {
            classes[i] = array[i] == null ? null : array[i].getClass();
        }
        return classes;
    }

    /**
     * 获取Annotation
     *
     * @param handlerMethod  HandlerMethod
     * @param annotationType 注解类
     * @param <A>            泛型标记
     * @return {Annotation}
     */
    @Nullable
//    public static <A extends Annotation> A getAnnotation(HandlerMethod handlerMethod, Class<A> annotationType) {
//        // 先找方法，再找方法上的类
//        A annotation = handlerMethod.getMethodAnnotation(annotationType);
//        if (null != annotation) {
//            return annotation;
//        }
//        // 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
//        Class<?> beanType = handlerMethod.getBeanType();
//        return AnnotatedElementUtils.findMergedAnnotation(beanType, annotationType);
//    }

    /**
     * 判断是否有注解 Annotation
     *
     * @param method         Method
     * @param annotationType 注解类
     * @param <A>            泛型标记
     * @return {boolean}
     */
    public static <A extends Annotation> boolean isAnnotated(Method method, Class<A> annotationType) {
        // 先找方法，再找方法上的类
        boolean isMethodAnnotated = AnnotatedElementUtils.isAnnotated(method, annotationType);
        if (isMethodAnnotated) {
            return true;
        }
        // 获取类上面的Annotation，可能包含组合注解，故采用spring的工具类
        Class<?> targetClass = method.getDeclaringClass();
        return AnnotatedElementUtils.isAnnotated(targetClass, annotationType);
    }

}
